In this carbonate platform, the 87 Sr/ 86 Sr value follows a decreasing trend (hydrothermal alteration trend) due to the Sr exchange of carbonate mineral under the influence of hydrothermal fluid after deposition.
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In-situ δ<sup>18</sup>O and <sup>87</sup>Sr/<sup>86</sup>Sr proxies in an unconformable clastic unit at the Ordovician-Silurian transition.
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